Lipoxin-mediated inhibition of IL-12 production by DCs: a mechanism for regulation of microbial immunity

17 December 2001

journal article
research article
Published by Springer Nature in Nature Immunology

Vol. 3 (1) , 76-82
https://doi.org/10.1038/ni745

Abstract

Lipoxins are eicosanoid mediators that show potent inhibitory effects on the acute inflammatory process. We show here that the induction of lipoxin A₄ (LXA₄) accompanied the in vivo suppression of interleukin 12 (IL-12) responsiveness of murine splenic dendritic cells (DCs) after microbial stimulation with an extract of Toxoplasma gondii. This paralysis of DC function could not be triggered in mice that were deficient in a key lipoxygenase involved in LXA₄ biosynthesis. In addition, DCs pre-treated with LXA₄ became refractory to microbial stimulation for IL-12 production in vitro and mice injected with a stable LXA₄ analog showed reduced splenic DC mobilization and IL-12 responses in vivo. Together, these findings indicate that the induction of lipoxins in response to microbial stimulation can provide a potent mechanism for regulating DC function during the innate response to pathogens.

Keywords

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